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9-182 PPC405 Core User’s Manual
sync
Synchronize
sync
Synchronize
The sync instruction guarantees that all instructions initiated by the processor preceding sync will
complete before sync completes, and that no subsequent instructions will be initiated by the
processor until after sync completes. When sync completes, all storage accesses that were initiated
by the processor before the sync instruction will have been completed with respect to all mechanisms
that access storage.
If instruction bit 31 contains 1, the contents of CR[CR0] are undefined.
Registers Altered
• None.
Invalid Instruction Forms
• Reserved fields
Programming Note
Architecturally, the eieio instruction orders storage access, not instruction completion. Therefore,
non-storage operations that follow eieio could complete before storage operations that precede eieio.
The sync instruction guarantees ordering of instruction completion and storage access. For the
PPC405 core, the eieio instruction is implemented to behave as a sync instruction.
To write code that is portable between various PowerPC implementations, programmers should use
the mnemonic that corresponds to the desired behavior.
Architecture Note
This instruction is part of the PowerPC User Instruction Set Architecture.
sync
31 598
0 6 21 31